Rotational speed control circuit for a D.C. motor

Details Rotational speed control circuit for a D.C. motor Rotational speed control circuit for a D.C. motor

1979-01-19

1981-06-16

Smith, Jr., David

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318345F, 318345AB, 318317, H02P 516

Patent

active

042740363

ABSTRACT:
A rotational speed control circuit for a D.C. motor includes a power transistor with its emitter-collector path connected in series with the D.C. motor and a power supply. A base current of the power transistor is controlled by an output of a differential amplifier which is supplied at its one of input terminals with a constant voltage and at the other input terminal with a voltage changing in accordance with a terminal voltage of the D.C. motor. Further the latter input terminal of the differential amplifier is given a variable bias potential by means of an adjustable mechanism. By this circuit configuration, the rotational speed of the D.C. motor can be continuously and proportionally adjusted over a wide range and once the rotational speed is set to predetermined value by the adjustable mechanism, a stable and constant speed control for the D.C. motor can be achieved.

REFERENCES:
patent: 3231808 (1966-01-01), McDaniel
patent: 3250981 (1966-05-01), Marks
patent: 3447056 (1969-05-01), Kosaka et al.
patent: 3568027 (1971-03-01), Bacon et al.

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